Cast Foam
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Cast Foam
Cast Foam
Lightweight, non-sticky formula locks strands into a cast, enhancing shape while controlling frizz for defined, bouncy waves with none of the stiffness or crunch! Best when used as the fourth step in Merwave’s five-step wavy hair routine. 180ml
- Delivered in 2–3 business days
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BENEFITS
BENEFITS
- Forever lightweight - all of Merwave’s products are specially formulated to ensure your waves won’t be weighed down
- Silicone, sulphate and paraban free.
- Safe for coloured or bleached hair
INGREDIENTS
INGREDIENTS
Aqua (Water), VP/VA Copolymer, Cocamidopropyl Betaine, Polyquaternium-16, PEG-35 Castor Oil, Panthenol, Benzophenone-4, Amyl Cinnamal, Citronellol, Phenoxyethanol, Ethylhexylglycerin, Geraniol, Citric Acid, Hexyl Cinnamal, Limonene, Parfum (Fragrance).
Curly Girl Approved.
SHIPPING & DELIVERY
SHIPPING & DELIVERY
All orders are processed within 1 to 2 business days (excluding weekends and holidays).
UK Mainland Orders - FREE Over £60
All orders are processed within 1 to 2 business days (excluding weekends and holidays) after receiving your order confirmation email. You will receive another notification when your order has shipped.
Free shipping on all orders over £60 to UK mainland (does not include Northern Ireland).
Orders under this threshold cost £4.
Next Day Delivery - £7
We also offer Next Day Delivery for UK mainland orders at £7. Orders must be placed before 1pm (Monday to Friday) to be eligible for next working day delivery.
Orders placed after 1pm, on weekends or on bank holidays will be dispatched the next working day. Next Day Delivery is available on UK mainland orders only and does not include Northern Ireland.
Europe Orders - FREE over €70
Orders under this threshold will cost €10.
Does not include local taxes.
Delivery time is 5 business days.
Australia Orders - FREE over $130
Orders under this threshold will cost $42.
Delivery time is 7 business days.
Tracking
When your order has shipped, you will receive an email notification from us which will include a tracking number you can use to check its status. Please allow 48 hours for the tracking information to become available.
If you haven’t received your order within 10 business days of receiving your shipping confirmation email, please contact us at hello@merwave.co.uk with your name and order number, and we will look into it for you.
Once an order is placed we are unable to make any amendments. This includes order details, like adding products, and also altering your shipping address. You may be able to amend your address using the courier self service options once your order has been despatched. In this instance, we'd recommend proceeding with your order and returning any items you no longer wish for.

Before + After
Check our these real life results, using the Merwave range.
What’s inside
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CASTOR OILCASTOR OIL
Powerful anti-frizz ingredient with lightweight smoothing properties.
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PANTHENOLPANTHENOL
Penetrates the hair shaft, helping wavy hair retain bounce and softness, leaving it looking defined and feeling healthy.
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COCAMIDOPROPYL BETAINECOCAMIDOPROPYL BETAINE
Helps to smooth the hair cuticle, reducing frizz and making the hair more manageable.
How to use the Cast Foam
"I created this because every foam I tried was sticky, heavy or did nothing for wavy hair. I love how lightweight it is, yet it gives me the most gorgeous, defined waves without losing that natural movement. And unlike a mousse, it won’t leave your hair crunchy or overloaded, just soft, bouncy waves that actually hold."
Our mission
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Real ResultsReal Results
Zero hair retouch, authentic results from products that are tailor-made specifically to care for wavy hair
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Forever LightweightForever Lightweight
Focussed on thoughtfully-sourced ingredients for formulas that never weigh down waves
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CREATING COMMUNITYCREATING COMMUNITY
It’s not just a routine, it’s a lifestyle. Proudly celebrating connection - making waves with over 160,000 and growing!
You + Merwave
Our Merwave community is our heartbeat; see how they shape & inspire us
Customer Reviews
I’m loving the products. I struggled to keep my curly hair in the past from frizz. These products are amazing and i now feel very happy. Merwave has given me so much confidence .
I brought the full package to try all products as my hair can be fussy and annoying. I am overwhelmed with the amazing products you have created my hairs never looked or smelt so lovely and ive never been able to style my hair with such ease and confidence I have just shared the protein feed and gel with a work colleague whilst away for work.
I had given up hope that anything would make my hair less frizzy and more manageable but finally have found the right products !
My short hair styles well after following the five stages. It's certainly given me confidence in growing my post menopausal hair again. Thank you for recognising the difference between curly, wavy and straight hair.